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A Non-scanning Continuous Optical Coherent Velocity Lidar Based on Time Division Multiplexing

A technology of time-division multiplexing and laser radar, which is applied in the directions of measurement devices, utilization of re-radiation, climate sustainability, etc., can solve the problems of limited application and high cost, and achieve the effect of low cost, stable system and anti-electromagnetic interference

Active Publication Date: 2018-01-30
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in some special occasions, such as wind power generation, motorboat speed and surrounding speed measurement, etc., only a single point of wind vector is required, due to the high cost of mechanically scanning coherent lidar using pulsed lasers, its application is limited

Method used

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  • A Non-scanning Continuous Optical Coherent Velocity Lidar Based on Time Division Multiplexing
  • A Non-scanning Continuous Optical Coherent Velocity Lidar Based on Time Division Multiplexing
  • A Non-scanning Continuous Optical Coherent Velocity Lidar Based on Time Division Multiplexing

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Embodiment

[0030] figure 1 A schematic structural diagram of a non-scanning continuous optical coherent speed measuring lidar based on time division multiplexing provided by an embodiment of the present invention. Such as figure 1 As shown, it mainly includes: a continuous light laser 1, a fiber splitter 2, an optical switch 3, a first fiber circulator 4, a first optical transceiver device 5, a first fiber coupler 6, a second fiber coupler 7, Detector 8, acquisition card 9, data processing and display system 10, second optical fiber circulator 11, second optical transceiver 12 and signal generator 13; wherein:

[0031] The output end of the continuous optical laser 1 is connected to the input end of the optical fiber beam splitter 2, the output end A of the optical fiber beam splitter 2 is connected to the input end of the optical switch 3, and the control signal input end of the optical switch 3 is connected to the control signal generator 13. Signal output connection;

[0032] The o...

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Abstract

The present invention discloses a non-scanning continuous optical coherence speed measurement laser radar based on time-division multiplexing. According to the radar, a fiber continuous laser is used as a light source, and through focusing laser beams at an atmosphere detection region, by using aerosol back direction scattered signal of a laser focusing part and the mode of local oscillator optical coherent beat frequency, wind speed detection is realized. Receiving ends are two optical transceivers with a fixed direction and an adjustable focal distance, the two optical transceivers alternatively work through the time-division multiplexing technology, and thus non-scanning wind vector detection is realized. At the same time, the direction of the two transceivers can be adjusted according to different applications, thus the large wind vector measurement and the measurement of the speed of the platform where the laser radar is are realized, and the radar has the advantages of high detection accuracy, low cost, compact structure, electromagnetic interference resistance, and stable system.

Description

technical field [0001] The invention relates to the field of speed measuring laser radar, in particular to a non-scanning continuous light coherent speed measuring laser radar based on time division multiplexing. Background technique [0002] In atmospheric wind speed remote sensing, coherent wind lidar has been widely used in atmospheric wind profile detection, wind shear early warning, aircraft wake detection, wind power generation, aerospace and military due to its high precision and high temporal and spatial resolution. field. [0003] The light source of coherent wind lidar adopts pulse laser or continuous laser. Coherent wind lidar using pulsed lasers can detect wind speed information along the entire laser path, and is a hot research field of lidar. International organizations engaged in pulse coherent lidar research include NASA, NOAA, Lockheed Martin, Raytheon, CTI, Mitsubishi Electric, Leosphere, The French Aerospace Research Center (ONERA), the British SgurrEne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/95
CPCG01S17/95Y02A90/10
Inventor 夏海云上官明佳窦贤康王冲
Owner UNIV OF SCI & TECH OF CHINA
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